Tinnitus can be categorized into primary tinnitus and secondary tinnitus. Occasional tinnitus in the ear can be caused by a variety of reasons, which may be idiopathic without cause, or auditory and non-auditory system disorders. 1. Primary tinnitus: idiopathic tinnitus with or without sensorineural deafness, the cause of which is currently unknown. 2. Secondary tinnitus (1) Auditory system disorders: Tinnitus can be caused by simple cerumen impaction of the external auditory canal, middle ear diseases such as otosclerosis and eustachian tube dysfunction, cochlear anomalies such as Meniere’s disease, and auditory system disorders such as acoustic neuronopathies like acoustic neuroma. (2) Non-auditory system disorders: including vascular abnormalities, myoclonus, increased intracranial pressure, mental stress, etc., can cause tinnitus. The causes of tinnitus are extremely varied. If tinnitus occurs frequently, it is necessary to consult a doctor in time for a systematic examination to make a clear diagnosis.